<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .father {
            background-color: #ff8500;
            width: 500px;
            height: 400px;
            padding-top: 100px;
        }
        .son {
            background-color: white;
            width: 100px;
            height: 100px;
            margin-left: auto;
            margin-right: auto;
        }
    </style>
</head>
<body>
<div class="father">
  <div class="son"></div>
</div>
</body>
</html>